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CVE-2026-26164CriticalMonitor

M365 Copilot Information Disclosure Vulnerability

Severity Critical  ·  Urgency Monitor

Why it matters: Critical severity (CVSS 7.5)

Information Disclosure · Critical · CVSS 7.5. Affects: Microsoft 365 Copilot's Business Chat.

CVSS 7.5EPSS 0.8%Update published 2026-06-23Source updated 2026-06-23NVD

Affected: Microsoft 365 Copilot's Business Chat

Change history

2026-06-23 · First seen

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